Buggy code:
public class Proxy extends Thread { private static final Logger log = LoggingManager . getLoggerForClass ( ) ; private static final byte [ ] CRLF_BYTES = new byte [ ] { 13 , 10 } ; private static final String CRLF_STRING = "\r\n" ; private static final String NEW_LINE = "\n" ; private static final String [ ] headersToRemove ; private static final String PROXY_HEADERS_REMOVE = "proxy.headers.remove" ; private static final String PROXY_HEADERS_REMOVE_DEFAULT = "If-Modified-Since,If-None-Match,Host" ; private static final String PROXY_HEADERS_REMOVE_SEPARATOR = "," ; private static final String KEYSTORE_TYPE = JMeterUtils . getPropDefault ( "proxy.cert.type" , "JKS" ) ; private static final String KEYMANAGERFACTORY = JMeterUtils . getPropDefault ( "proxy.cert.factory" , "SunX509" ) ; private static final String SSLCONTEXT_PROTOCOL = JMeterUtils . getPropDefault ( "proxy.ssl.protocol" , "SSLv3" ) ; private static final HashMap < String , SSLSocketFactory > hashHost = new HashMap < String , SSLSocketFactory > ( ) ; private static final String CERT_DIRECTORY = JMeterUtils . getPropDefault ( "proxy.cert.directory" , JMeterUtils . getJMeterBinDir ( ) ) ; private static final String CERT_FILE_DEFAULT = "proxyserver.jks" ; private static final String CERT_FILE = JMeterUtils . getPropDefault ( "proxy.cert.file" , Proxy . CERT_FILE_DEFAULT ) ; private static final char [ ] KEYSTORE_PASSWORD = JMeterUtils . getPropDefault ( "proxy.cert.keystorepass" , "password" ) . toCharArray ( ) ; private static final char [ ] KEY_PASSWORD = JMeterUtils . getPropDefault ( "proxy.cert.keypassword" , "password" ) . toCharArray ( ) ; private static final SamplerCreatorFactory factory = new SamplerCreatorFactory ( ) ; private static final Pattern COOKIE_SECURE_PATTERN = Pattern . compile ( "\\bsecure\\b" , Pattern . CASE_INSENSITIVE ) ; private OutputStream outStreamClient = null ; private Socket clientSocket = null ; private ProxyControl target ; private boolean captureHttpHeaders ; private boolean httpsSpoof ; private String httpsSpoofMatch ; private Map < String , String > pageEncodings ; private Map < String , String > formEncodings ; public Proxy ( ) { } void configure ( Socket _clientSocket , ProxyControl _target , Map < String , String > _pageEncodings , Map < String , String > _formEncodings ) { } @ Override public void run ( ) { } private SSLSocketFactory getSSLSocketFactory ( String host ) throws IOException { } private Socket startSSL ( Socket sock , String host ) throws IOException { } private InputStream getCertificate ( ) { File certFile = new File ( Proxy . CERT_DIRECTORY , Proxy . CERT_FILE ) ; InputStream in = null ; final String certPath = certFile . getAbsolutePath ( ) ; if ( ( certFile . exists ( ) ) && ( certFile . canRead ( ) ) ) { try { <START_BUG> in = new FileInputStream ( certFile ) ; <END_BUG> Proxy . log . info ( ( "Opened<seq2seq4repair_space>Keystore<seq2seq4repair_space>file:<seq2seq4repair_space>" + certPath ) ) ; } catch ( FileNotFoundException e ) { Proxy . log . error ( ( "No<seq2seq4repair_space>server<seq2seq4repair_space>cert<seq2seq4repair_space>file<seq2seq4repair_space>found:<seq2seq4repair_space>" + certPath ) , e ) ; } } else { Proxy . log . error ( ( "No<seq2seq4repair_space>server<seq2seq4repair_space>cert<seq2seq4repair_space>file<seq2seq4repair_space>found:<seq2seq4repair_space>" + certPath ) ) ; } return in ; } private static SampleResult generateErrorResult ( SampleResult result , Exception e ) { } private void writeToClient ( SampleResult res , OutputStream out , boolean forcedHTTPS ) throws IOException { } private String messageResponseHeaders ( SampleResult res , boolean forcedHTTPS ) { } private void writeErrorToClient ( String message ) { } private String addPageEncoding ( SampleResult result ) { } private void addFormEncodings ( SampleResult result , String pageEncoding ) { } private String getUrlWithoutQuery ( URL url ) { } }

Fix:
in = new BufferedInputStream ( new FileInputStream ( certFile ) ) ;